50 Word Summary:
Sunburst, representing Ekkremes's reemergence of mana, appears in all colors but is focused in Green and Red, with Red getting one-shot mana filtering to support it. Monocolor-Hybrid and colorless-matters (all colors, but mostly Blue/Black/White) represent the technotopia that dominated a mana-poor world. Smoothing mechanic Bulldoze supports both multicolor and colorless.

Militant Mystic 2R
Creature - Human Wizard
Sunburst - ~ enters the battlefield with a +1/+1 counter on it for each color of mana spent to cast it.
First strike
0/0

Demolition Crew {2/R}{2/R}
Artifact Creature - Human Mutant
Bulldoze - When ~ enters the battlefield, you may sacrifice a land. If you do, search your library for a basic land card or a Building card and put it onto the battlefield tapped. Then shuffle your library.
2/2

Solar Flare 2R
Instant
Sunburst - Creatures you control get +1/+0 until end of turn for each color of mana spent to cast ~.

Power Plant 2
Artifact
Operate 1 (1: Attach an unattached creature you control to this artifact, or unattach a creature from it. An attached creature can't attack or block. Operate only as a sorcery.)
T: add 1 to your mana pool. If a creature is operating ~, add one mana of any color to your mana pool instead.

Factory Explosion 2R
Instant
Destroy target artifact. If any creatures were operating that artifact, ~ deals 2 damage to each of those creatures.